Sunday, December 3, 2017

Chestnut drive Chemistry 2014



The total marks for this section is 40.

1
A substance was heated in a boiling tube and the physical states of the substance were obtained at the given temperatures.
temperature / oC
physical state
60.0
liquid
62.0
liquid
64.0
liquid – gas
66.0
liquid – gas
68.0
gas
70.0
gas

Temperature
 

Which graph correctly shows how temperature changes with time for the above experiment?

A








Time
 




B
Temperature
 












C
Temperature
 












D
Temperature
 












2
The diagram shows a simple laboratory apparatus used to prepare and collect a dry gas.

solution Q
 
solid P
 


Suggest the identities of solid P and solution Q.


solid P
solution Q


A
zinc oxide
sulfuric acid


B
lithium
water


C
calcium carbonate
nitric acid


D
copper
hydrochloric acid




3
Fire-fighters recognise four types of fires.
Class P:            Solids like wood and coal on fire.
Class Q:           Liquids like petrol, oil on fire.
Class R:           Gases like natural gas, carbon monoxide on fire.
Class S:            Metals like sodium or potassium on fire.

Below is a table of four substances A to D with their melting and boiling points.
Which substance at room temperature and pressure has an incorrect ‘class of fire’?


melting point/ °C
boiling point /°C
class of fire


A
+ 98
+ 883
S


B
-184
-164
R


C
- 117
+ 78
P


D
+ 5
+ 80
Q






4
Bromine melts at -7 oC and boils at 59 oC. A reddish-brown solution of aqueous bromine was heated using the setup shown below.

X
 


Y
 

What are the colours of solutions X and Y when the reading on the thermometer shows 60oC?


solution X
solution Y


A
reddish brown
colourless


B
colourless
reddish brown


C
red
brown


D
brown
red




5
Which one of the following is true of a compound?

A
Its constituents can be separated by physical methods.



B
A compound is always soluble in water.



C
Its constituents are present in fixed proportions.



D
Its properties are similar to those of its constituents.








6
The table shows some information about the solubilities of three solids.
solid
solubility in water
solubility in ethanol
J
K
L
insoluble
soluble
insoluble
soluble
insoluble
insoluble

The following operations could be carried out to obtain pure K from a mixture of
J, K and L.
                        1          filter
                        2          evaporate filtrate to dryness
                        3          add ethanol
                        4          add water
In what order should the operations be carried out?

A
1, 2, 3, 4



B
3, 1, 2 (omit stage 4)



C
4, 3, 1, 2



D
4, 1, 2 (omit stage 3)





7
The diagram shows how a particle is deflected when it enters the field between two oppositely charged plates.













Which statement could be true about the particle?

A
It is the nucleus of an argon atom.



B
It is a molecule of hydrogen.



C
It is an ion of sulfur.



D
It is an atom of sodium.





8
The table below shows three pairs of structures.

R
 
Q
 
P
 

Which pair(s) have similar chemical properties but different physical properties?

A
P only



B
P and Q only



C
P and R only



D
P, Q and R





9
Fibreglass can be considered to be a mixture of ionic oxides and giant covalent oxides. Which one of the following is not a constituent of fibreglass?

A
Al2O3



B
Na2O



C
P4O10



D
SiO2








10
Boron nitride is used as a solid lubricant in industrial machines up to temperatures of
1000 oC.Which of the following is the most likely structure of boron nitride?

A
B






C
D








11
120 cm3 of polluted air is passed through limewater so that all the carbon dioxide is precipitated as calcium carbonate. The mass of calcium carbonate formed is 0.005 g.
What is the percentage by volume, of carbon dioxide in the air sample?

A
1.0 %



B
0.5 %



C
0.05 %



D
0.01 %





12
Which of the following contains the largest number of molecules?

A
4.4 g of carbon dioxide gas    



B
0.05 mol of hydrogen gas



C
12 dm3 of oxygen gas 



D
1200 cm3 of water vapour












13
The diagram shows three balloons filled with 240 g of different gases.


neon
 
argon
 
bromine
 

What is the ratio of the number of gas particles present in each balloon?


neon

argon

bromine


A
1
:
1
:
1


B
1
:
2
:
4


C
2
:
1
:
4


D
8
:
4
:
1




14
A solid X is added to three different test tubes containing hydrochloric acid, sodium hydroxide and water respectively. The following results are obtained.
hydrochloric acid
sodium hydroxide
water
observation
solid dissolves
solid dissolves
solid is insoluble

Which of the following could be solid X?

A
magnesium oxide



B
zinc oxide



C
sodium oxide



D
iron(II) oxide





15
In which reaction is calcium hydroxide not acting as a base?

A
Ca(OH)2 + Na2SO4à CaSO4 + 2 NaOH



B
Ca(OH)2 + CO2à CaCO3 + H2O



C
Ca(OH)2 + 2 HClà CaCl2 + H2O



D
Ca(OH)2 + 2 NH4NO3à Ca(NO3)2 + 2 NH3 + H2O








16
Which graph shows the solution formed when 1 mol of a weak acid, HX is dissolved in
1 dm3 of water?

A



B



C



D








17
The table below gives information about three indicators.
indicator
colour change from low pH to high pH
pH at which colour change takes place
methyl orange
red à yellow
4
phenolphthalein
colourless à pink
9
bromothymol blue
yellow à blue
6.5

If equal volumes of these three indicators were mixed, which colour would be observed at pH 5?

A
blue



B
green



C
yellow



D
orange





18
When a few drops of solution X are added to an aqueous solution of Fe2+ ions, the green solution turns yellow. Which statement about X is true?

A
X decolourises aqueous potassium manganate(VII).



B
X changes the colour of Universal Indicator from green to red.



C
X produces a yellow precipitate with potassium iodide.



D
X forms a brown solution with aqueous potassium iodide.





19
Which of the following is an observation of a redox reaction?

A
Bubbles of gas observed when acid reacts with solid lumps of magnesium carbonate.

B
Solution turns blue when copper(II) sulfate crystals are added to hydrochloric acid.

C
Blue precipitate formed when aqueous ammonia is added to copper(II) nitrate solution.

D
Aqueous bromine is decolourised when ethene gas is bubbled into it.



20
Which of the following does not take place in the blast furnace in the extraction of iron?

A
C + O2à CO2



B
CaSiO3à CaO+ SiO2



C
C + CO2à 2 CO



D
Fe2O3 + 3 CO à 2 Fe + 3 CO2





21
Which chart best represents the composition of a galvanized steel roof?

A
carbon
 











B
iron
 










C
zinc
 










D
zinc
 
iron
 
carbon
 

















22
The graph shows the percentage of metals recycled and mined in the United States in 2007.
Which of the following statements may be true?

A
Demand for nickel is higher than for copper.



B
More pollution is generated when copper is recycled compared to iron.



C
Recycling zinc is cheaper than extracting zinc from its ore.



D
Few people know about the benefits of recycling tin compared to zinc.





23
Element X is extracted by the electrolysis of a molten compound of elements X and Y.
The electrode reactions are shown below.
At the cathode:
At the anode:
X2+ + 2 e-àX
2 Y2-àY2 + 4 e-

Which of the following could be the compound?

A
calcium chloride



B
copper(II) chloride



C
sodium oxide



D
lead(II) oxide








24
The diagram shown is not complete.


graphite electrodes
 

What would be shown at X after the solution has been electrolysed for some time?

A
B






C
D








25
Rubidium is below potassium in the Periodic Table.
Which statement about rubidium is likely to be true?

A
It has a higher melting point than potassium.



B
It reacts slowly with water.



C
It forms an insoluble salt when reacted with hydrochloric acid.



D
It is so soft that it can be cut with a knife.








26
In the set up below, a magnesium electrode and a zinc electrode are inserted into a lemon.
The bulb did not light up.













What change could result in the bulb lighting up?

A
Insert the copper wires into the lemon without the electrodes.



B
Exchange the positions of the electrodes.



C
Replace the zinc electrode with silver.



D
Use graphite electrodes instead of magnesium and zinc.





27
The diagram below shows an alternative form of the Periodic Table.

Y
 
X
 

Which trend best describes how the elements change along the dotted line X – Y?

A
The number of valence electrons increase from X to Y.



B
The number of electron shells decrease from X to Y.



C
The metallic character decreases from X to Y.



D
The proton number increases from X to Y.





28
Which of the following statements best describes the change in properties across a period in the Periodic Table?

A
The number of neutrons in the nucleus increases.



B
The charge of the ions formed increases in magnitude.



C
The elements become less metallic in nature.



D
The atomic radius of the elements increases.





29
Which graph below shows how temperature changes in an exothermic reaction?

A
B




temperature
 












temperature
 


time
 




C
D






temperature
 












time
 


temperature
 








30
A solution of hydrogen peroxide releases oxygen slowly at room temperature.
hydrogen peroxide à water + oxygen
The diagram shows the effect of adding blood to hydrogen peroxide.
What could be the reason for this change?

A
Blood contains water which increases the concentration of water.



B
Blood contains an enzyme which catalyses the reaction.



C
Blood pressure is higher than atmospheric pressure.



D
The concentration of hydrogen peroxide increases when blood is added.





31
In an experiment, 0.325 g of zinc reacts with an excess of hydrochloric acid. The graph shows how the volume of hydrogen produced varies with time.
 


















In a second experiment, 0.650 g of zinc reacts with an excess of hydrochloric acid.
For the second experiment, at which point will the graph become horizontal?



32
Ammonia is manufactured on a large scale by a reversible reaction in the Haber process.
Which of the following is true about a reversible reaction?

A
A high temperature is needed for the reaction to occur.



B
A catalyst is needed for a reversible reaction.



C
The reaction has low activation energy.



D
The yield of the products will be less than 100 %.





33
Which of the following methods would not produce ammonia?

A
heating zinc nitrate with sodium hydroxide after adding a piece of aluminium



B
heating ammonium chloride with calcium hydroxide



C
heating ammonium sulfate with dilute hydrochloric acid



D
heating ammonium sulfate with sodium hydroxide





34
Which of the following is not responsible for the formation of photochemical smog?

A
ethene



B
oxides of nitrogen



C
ozone



D
sulfur dioxide





35
The diagram shows ethanol burning inside a sealed jar.

The mass of one gas in the jar does not change. Which gas is this?

A
carbon dioxide



B
nitrogen



C
oxygen



D
water vapour








36
The diagram shows the manufacture of an important organic chemical X.
What is the structural formula of X?

A



B



C



D





37
The molecular formula of oleic acid is C18H34O2. How many double bonds between carbon atoms are present in one molecule of oleic acid?

A
1



B
2



C
3



D
4








38
When an alkene reacts with bromine, the product formed is
This implies that the original structure of the alkene is

A



B



C



D





39
Compound Z is formed by the oxidation of ethanol. Which of the following is not a property of Z?

A
It is sour.



B
It is a strong acid.



C
It is used to preserve food.



D
It produces hydrogen gas with zinc.








40
A condensation polymer is to be made from the two monomers below:

and
 

           
Which diagram shows the structure of the polymer?

A



B



C



D







END OF PAPER 1






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